Remove outputs blocking inputs when output is slow (#4938)

plugins/inputs/nsq_consumer/nsq_consumer_test.go

@@ -36,11 +36,12 @@ func TestReadsMetricsFromNSQ(t *testing.T) {
 	newMockNSQD(script, addr.String())
 
 	consumer := &NSQConsumer{
-		Server:      "127.0.0.1:4155",
-		Topic:       "telegraf",
-		Channel:     "consume",
-		MaxInFlight: 1,
-		Nsqd:        []string{"127.0.0.1:4155"},
+		Server:                 "127.0.0.1:4155",
+		Topic:                  "telegraf",
+		Channel:                "consume",
+		MaxInFlight:            1,
+		MaxUndeliveredMessages: defaultMaxUndeliveredMessages,
+		Nsqd: []string{"127.0.0.1:4155"},
 	}
 
 	p, _ := parsers.NewInfluxParser()